Can not restore when there is a primary key violation

 My table "Tbl1" contains primary keys (1,2,3,4,5,6,7,8,9 and 10),

I took a backup of "Tbl1" to backup file "Backup1.sql",

then deleted all records,

and added a column with primary key 5.

and tried to restore Backup file "Backup1.sql"

But it did not restore any columns....Is there any Option to restore all other columns except 5.